Ventilating apparatus.



UNITED STATES PATENT OFFICE.

PAUL WAGNER, OF CHARLOTTENBURG, GERMANY, ASSIGN OR TO GENERAL ELECTRIC COMPANY, A CORPORATION NEW YORK.

VENTILATING APPARATUS.

Specification of Letters Patent.

y Patented July 23, 1918.

Application led April 27, 1915. Serial No. 24,373.

To all whom t may concern.'

Be it known that I, PAUL WAGNER, a subject of the King of Prussia, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Ventilating Apparatus, of which the following is a specification. v

The present invention relates to an improved arrangement for utilizing the exhaust vapors or gases from an engine, as an internal combustion engine, for- 'ventilating the inclosure containing the engine. The invention is particularly applicable for use in connection with motor vehicles, as for example, gas-electric cars or motor boats where the engine room is usually small and satisfactory ventilation dificult. It is not, however, limited thereto.

In carrying out my invention I provide a stack or chimney on the upper portion or roof of the engine room, which comprisesa ventilating passage and is arran ed to inclose the exhaust silencer or m er of the engine. By this means the exhaust from the engine heats the air in or adjacent the Ventilating passage, thus causing a current of air to pass through it dueto convection. In addition to this, or in some instances in lieu thereof, I may also so .arrange the parts that the discharge from the exhaust silencer will act as an ejector for'creating draft.

For a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.

In the accompanying drawing, Figure 1 ,illustrates one f orm which my invention may take, and Fig. 2 a second form.

Referring first to Fig. 1, 3 indicates the roof of an inclosure containing an internal combustion engine and 4 a stack or chimney. The stack or chimney comprises two concentric casings 5 and 6 forming between them an annular Ventilating space or passage 7, Supported inside the inner casing by means of the fianged member 8 is the exhaust silencer or muler 9 of the engine?V The engine4 is not illustrated as its specific type or structure forms no part of the present invention. In the arrangement shown the exhaust silencer 9 is formed with a collar 10 at about its central point which rests on the member 8, the exterior of the silencer being spaced from the inner surface of the casing 5. The easing 5 is provided with passages 11 and 12 through which the air passes to and from the Ventilating space or passage 7.

When the engine is in operation, the exhaust vapors or gases passing through the exhaust silencer 9 heats the surrounding air below the collar 10, thus causing a flow of air by convection from the interior of the inclosure 3 up .through openings 11, passage 7, and openings 12, to the outer air. At the same time fresh air will be drawn into'the inclosure through doors and windows, or especially provided Ventilating openings.

Referring now to Fig. 2, the same reference numerals have been used to designate corresponding parts, as in Fig. 1. Substantially the same structure is shown with the exception that I have added thereto an arrangement whereby I utilize the escape of gases from the silencer 9 yto produce an ejector action to suck air through the ventilating passage. Tothis end I form the inner casing 5 with an inwardly projecting portion 15 forming in substance a Venturi section, and the escape end of the silencer 9 is provided with a flaring n0zzle'16, the end of which terminates at the throat of the venturi. By this arrangement the vapors or gases escaping from the nozzle 16 produce a suction action, as is well understood, thus providing an additional means tending to create a draft up the Ventilating passage.

Although I now prefer to use the specific varrangement as shown in Fig. 2 wherein I utilize not only the convection currents, but also the suction action, it will be understood that my invention when viewed in this aspect is not limited to this arrangement and that I may use either alone.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to Arepresent the best embodiment thereof; but I desire to have it understood that the apparatus shown is 'only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, 1s,-

1. The combination with an inclosure, of

`a stack thereon comprising. two concentric Walls spaced apart to form a Ventilating passage between them closed at its ends, the inner wall having vertically spaced openings into said passage, an exhaust silencer located in and spaced from the inner wall, means surrounding the exhaust silencer between said openings dividing the space 1between the Inuiier and the inner wall into an upper and a lower chamber, which chambers are in communication with the ventilating passage through said vertically spaced openings, means forming a restricted passage at the outer end of the stack; and a nozzle on the end of the silencer which cooperates with the restricted passage to form an ejector.

2. The combination with an inclosure adapted to contain an engine, of a stack thereon comprising two concentric walls spaced apart to form an annular Ventilating passage, a ledge in the stack carried by the inner of the two concentric Walls, a muliier of lesser diameter than the stack and having a flange which rests on said ledge whereby a chamber surrounding the muiiier is formed above and below the iange, said lower chamber being in communication with the inclosure, said inner wall having openings which connect it to said Ventilating passage above and below said flange, and a nozzle on the outer end of the muiiler arranged to create a suction through the pas- Y sage.

In witness whereof, I have hereunto set my hand this 29th day of March, 1915 l PAUL WAGNER. Witnesses:

ELRIGH UBERLE, M. SELLMANN. 

